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Definitions

high-speed

[hahy-speed] / ˈhaɪˈspid /
ADJECTIVE
breakneck
Synonyms
STRONGEST
headlong rapid
WEAK
at full tilt dangerously fast excessive flat out lightning precipitate reckless speedy whirlwind
Antonyms
WEAK
extremely slow
ADJECTIVE
express
Synonyms
STRONG
accelerated fast nonstop quick rapid swift
WEAK
velocious
Antonyms
STRONG
slow sluggish
WEAK
imprecise indefinite indirect obscure uncertain vague
ADJECTIVE
jazzed-up
Synonyms
WEAK
gassed-up high geared high performance hopped-up pepped-up pumped-up revved-up speedy supercharged

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Another fan, who came from Wu Yize's home province and took hours to reach Xi'an via high-speed train, brought along a photo of the champion to get it signed.

From BBC • May 7, 2026

After a suspect crashed during a high-speed chase, CBS Los Angeles spotted a Riverside deputy scrolling through what appeared to be a woman’s dating app profile during the ensuing standoff.

From Los Angeles Times • May 7, 2026

What’s Next: Sandisk’s sales growth is accelerating because high-speed storage chips have become crucial to artificial-intelligence servers.

From Barron's • May 6, 2026

A refundable reservation on one of Europe’s many high-speed trains could become useful if the situation becomes more dire and your flight doesn’t operate, Harteveldt said.

From MarketWatch • Apr. 28, 2026

But this technology was still not capable of “approaching, much less surpassing, the success of the radioactive elements, in providing us with high-speed electrons and high-speed atoms.”

From "Big Science" by Michael Hiltzik